| PALEOLIMNOLOGY |
Hydrological variability in southeastern Patagonia and explosive volcanic activity in the southern Andean Cordillera during
Oxygen Isotope Stage 3 and the Holocene inferred from lake sediments of Lag
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Haberzettl, T.,Ohlendorf, C.,Zolitschka, B. 2008 Hydrological variability in southeastern Patagonia and explosive volcanic
activity in the southern Andean Cordillera during Oxygen Isotope Stage 3 and the Holocene inferred from lake sediments of
Lag Palaeogeography, Palaeoclimatology, Palaeoecology in press 2008
| Data Coverage |
North: -51.95 * South: -51.95 |
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West: -70.3833 * East: -70.3833 |
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Altitude: 113 m |
Start Year: 44800 cal yr BP * End Year: -48 cal yr BP
Data: Please Cite Data Contributors!
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Summary: Seismic reflection studies in the maar lake Laguna Potrok Aike
(51º58'S, 70º23'W) revealed an erosional unconformity associated
with a sub-aquatic lake-level terrace at a water depth of 30m.
Radiocarbon-dated, multi-proxy sediment studies of a piston core
from this location indicate that the sediment below this
discontinuity has an age of 45kyr BP (Oxygen Isotope Stage 3),
and was deposited during an interval of high lake level.
In comparison to the Holocene section, geochemical indicators
of this older part of the record either point towards a different
sediment source or to a different transport mechanism for Oxygen
Isotope Stage 3 sediments. Holocene sedimentation started again
before 6790cal. yr BP, providing a sediment record of hydrological
variability until the present. Geochemical and isotopic data
indicate a fluctuating lake level until 5310cal. yr BP. During the
late Holocene the lake level shows a receding tendency. Nevertheless,
the lake level did not drop below the 30m terrace to create another
unconformity. The geochemical characterization of volcanic ashes
reveals evidence for previously unknown explosive activity of the
Reclús and Mt. Burney volcanoes during Oxygen Isotope Stage 3.
More Info on Paleolimnology |
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Complete XML Record: noaa-lake-6065
(Last Revised: 2009-02-11 )
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